Say the under-hood temperature of a racecar at speed is degrees. Air from the outside is considerably cooler, but we race in the summer, when ambient temperatures are still pretty hot. Eighty degrees is better than degrees, but after you do the math, the power increase is roughly 4 percent, best case scenario.
But there is another critical element to cold air intakes for making power, and that comes in the form of increased and improved air flow. A cold-air intake that restricts air flow compared with a stock system will nullify all the benefits of decreased air intake temperatures. For a system to be effective, a system must ensure the volume of cold air coming in is equal to or better than the volume of air you were getting with the stock system.
Fiello and Marty point out that is becoming more challenging as OEM systems improve. In fact, many OEM systems already are cold air intake systems. The key to gaining power from air flow is to minimize disruptions and obstructions to achieve laminar air flow, that is, any airstream that is flowing in a largely parallel path, according to Marty, and to increase the volume of air going into the engine, which will require more fuel to make additional power.
Laminar air flow is the most effective in the subsonic world. There is a limit to what a stock engine control system will accommodate, particularly when you are talking about newer cars. Fiello said that as fuel economy and emissions standards tighten, factory fuel trim windows have narrowed.
The math for air flow is much simpler and the power gains greater, Marty said. So, you get more power proportionally from a relatively small change in restriction, than you get from a relatively small change in temperature. They have been tested to take in colder air, reduce restriction and meet emissions standards. So instead of having four layers of oiled cotton gauze, you might only need two layers of cotton, with no oil on it, which would result in freer air flow.
When routing your intake tubing, use larger tubing than stock, minimize bends — think increased radius — and have it pick up its air from as fresh and unobstructed a place as possible. Fender wells might have cooler air than under the hood, but there are lot of pitfalls there. Also remember to keep the number of joints to a minimum. Each time you have a joint in intake tubing, you have a potential disruption point in that sacred laminar air flow.
This seems way to simplified, in my experience biggest difference is the change in throat diameter or air flow profile at the Mass air meter? More often than not when I put the bore gauge in a cold air intake the throat diameter does not match the OEM or a change in the intake modifies the flow pattern across the MAF. I have attributed the large gains found with intakes to be largely associated with the modification the VE tables from manipulation of the MAF evident when data logging on the dyno before and after installation.
These are not cold intake systems! Cold intake is when theres a pipe routed to the exterior of the vehicle drawing in cold uninterrupted air! I agree with Tony!
Any books-on system that has box under the hood with a bigger filter is not a cold air intake!! As far as ducting goes? I used DWV that stands for drain waste and vent pipe , yup, plumbing pipe. First night u tested it, at 65 degrees at 80mph I got 2 more miles per gallon than before at same temp, soeed and stretch of road.
The increase was enough that the car almost felt like it was in full sport mode which takes it from , to HP. Even on hot days there is a difference, although not as dramatic. Faster lap times in the track than before. And when the temps drop further than 65 degrees? You get more. Down to about 45 degrees. The reason I kept the factory airbox? The length of the piping? One is about 3 feet and the other is about five….
Any doubt that it is a pressurized system is removed when you see small gravel and insects in the filter box after going through a total of five bends in the longer pipe and three in the shorter pipe and after climbing 30 inches in height!! Bottom line? F1 cars have used ram air,its only worth 1 to 2 psi at to kph do you drive around at these speeds alot? Keith again, sorry for the stupid typos!!!!
Iy depends on naturally aspirated tur o charges ect. Combiningbwith cat back exuast can or encloswd air box ect. Your cold air intake also makes for freer airflow and less hot air building up in the engine compartment.
There are other benefits, too. An aftermarket cold air intake removes the need for a box to encompass the air filter, replacing it with smoother intake tubes. This allows the engine to have an uninterrupted air flow. But will a cold air intake really enhance the performance of your vehicle? The short answer is yes, although the way in which your engine performance improves may vary.
Improved horsepower and fuel efficiency are both possible, though not guaranteed; it just depends on your vehicle, the aftermarket product and the way that you drive. It is important to note that cold air intakes are strictly aftermarket products.
A trusted technician can help you make the decision of whether or not to invest in a cold air intake. If the air filter is too exposed and sucks up water, it'll go straight into your engine and you'll be up a creek. Pun intended. Look into adding a bypass valve to keep this from happening. Also, installing a cold air intake on some newer cars may void the engine manufacturer's warranty.
So look into this situation before starting, or at least understand that it could become a problem later on. Other than that, install that cold air intake and hear the magnificent sound of free-flowing cool air to your engine -- and enjoy a few extra horsepower as well. It may be just what your engine needs. This article reminded me of working on my brother's car back when we were in high school.
We made several modifications to his turbocharged Eclipse OK, it was a Plymouth Laser but it's the same engine! It definitely seemed to increase the power, or at least it sounded like it. I'm pretty sure that mod went better than the time we replaced the intercooler pipe and it popped off during our test run. There's nothing like thinking you blew something on the engine only to find out the pipe just needs to be reconnected! That car was so light and fast that we could get into some good races on the highway.
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